【Triple Display 4 in 1 Massive Hub】 HEYMIX USB C adapter has 2 x 4K HD video output port MST Triple Screen Available(Windows Only), 1 USB 3.0 ports, 1 Type-C PD Charging. No driver required. 【Dual HDMI 4K Output】 HEYMIX USB C Dual HDMI Adapter allows mac - OS to mirror or expand to 2 monitors, TVs, projectors simultaneously with resolution up to 4K@30Hz. Windows supports triple display screens(one for HDMI 1, one for HDMI 2, one for your laptop) in expand mode, Bring you triple efficiency. 【USB 3.0 Super Speed USB C Dock】USB 3.0 Port allows high-speed transferring up to 5 Gbps,or access to USB-enabled keyboard, mouse, HDD, flash drive. - Choose HEYMIX USB C 8 in 1 Hub as your powerful work or entertainment companion. Dual Video Resolution Configurations: 3840x2160@60Hz = 1 display / 3840x2160@30Hz = 2 displays / 2560x1440@60Hz = 2 displays / 1920x1080@60Hz = 2 displays Please Noted: The final resolution of HDMI output depends on your host devices, (Only when your devices support 4K resolution, the video output will be 4K). FAQ: How to switch Mac device to Extend Mode? "Setting" → "Display" → click the "mirror display" box to switch to Extend mode → then you can drag a window of website/movie to the rightest side of your desktop screen until it disappear on your desktop screen and show up on the external monitor screen. ( Important Note: As Apple company itself limited, for Mac OS devices use in extend mode, the image on the two external screens will be the same.) How to connect Extend Mode for Windows OS? Right-click desktop→ select Intel display Settings → pop-up Settings screen select display→ select multi-screen display→ expand the desktop (If the display 3 is not display, please to manually select the display→click apply confirm can set OK). If one of display does not display, How to do? Right click desktop > Graphics Settings > Select One or More Active Displays. Make sure the Type C port of your host device supports video output (some for data only), Please reset the default audio output device if you want to play audio via the HDMI devices. Not Support Mac devices to output two split screens, including: Mac - Book Air / Pro, i - Mac, etc.